On the Constitution of Mars

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Abstract
It is shown that the Earth model based on a compressibility-pressure hypothesis fits the theories that the density change across the boundary of the Earth's central core is purely a pressure phenomenon and that the Earth and Mars are of the same primitive composition. The fit is best if it is assumed that Mars has an inner core in the same proportion by mass as in the Earth and, correspondingly, that the material in the inner core of the Earth is chemically distinct from the material throughout the rest of the Earth below the crustal layers. This last pair of suggestions receives some support from a consideration of the moment of inertia and ellipticity of Mars.

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